Ethylidene norbornene
Ethylidene norbornene is an organic compound that consists of an ethylidene group attached to norbornene. It is a colorless liquid. The molecule consists of two sites of unsaturation. The compound consists of - and -stereoisomers, but the mixtures are typically not separated.
Preparation and use
It is prepared by isomerization of vinyl norbornene, which in turn is obtained by the Diels-Alder reaction of butadiene and cyclopentadiene.It is a monomer that used in the production of the commercial polymer EPDM. Only the ring alkene participates in the copolymerization. The exocyclic double bond undergoes sulfur vulcanization.